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Just got done reading through Year One, my first attempt to cox crack into this heroes universe outside of the show. I thought it was great, had me hooked into the very end! But where do I go from here, comics wise?

Just a word on Longbow Hunters: while it is a fairly decent read, it is quite dated. It was made during the grim and gritty era of comics and (in my opinion, at least) the Robin Hood era Ollie clashes against that backdrop, which made it a little hard to take seriously.

And this isn't so much a knock against it, but I realized I actually prefer Ollie a little younger. Ollie in Longbow Hunters is going through a bit of a mid-life crises, and while it's not done bad, I just prefer Ollie to be much younger.

These kind of inconsistences happen all the time in comics. And if those 2 things bother you so much then were you even paying attention to the story. I think it is common for people to be so caught up in what is canon and in continuity that they forget to look at the story.

I think you're taking what I said the wrong way. I really liked the book as evident by my saying

As much as I love it

I was simply pointing out that they made up 2 weaknesses for 2 characters that are never touched on again for the sake of making Deathstroke look cool. They didn't bother me so much that I didn't look at the story those details were just annoying. I can like something while having criticisms about it.

Read Kingdom Come. I think that is the comic that everyone who even cares a little about comics should read. It isn't focused on Green Arrow, but he's in it.
EDIT: Wow, already a downvote. Reddit never ceases to amaze me. I recommend a comic book and get downvoted.

Kingdom Come is always the first in my collections that I loan out because it's badass as fuck when my friends get interested in comics. That, All Star Superman, and Superman Red Son are my 3 favorite graphic novels.

The Longbow Hunters and Kevin Smith's run are great. If you wanna see one of the best friendship in the DC Universe check out the 70's Green Lantern/Green Arrow run. It also happens to be by one of the greatest comic teams of all time.

You mean GA specific or just in general? Because comics have a lot to offer in terms of good stories or impressive artwork. Might I suggest the first volume of Flash from the new 52 line to get you ready for the Flash show? Great writing and the artwork is some of the best out there. That dude captures motion so god damn good it makes me hurt.

Everyone has pretty much listed the essential stuff, however, I'd like to put in one more recommendation for the new 52 Green Arrow series. It's a damn good book and being familiar with the show you'll notice that Lemire (writer) didn't only draw inspiration from the comics but used aspects from the show as well.

As mentioned above start with #17 as everything before it was pretty much derivative crap. They just came out with a trade of it that you can pickup here on Amazon. In my opinion it is one of the best monthly comics coming out right now and it makes a great companion to the show (they've just introduced the comics version of Diggle).